A method of scheduling tasks for a Real-Time Operating System in a low-power, wireless, mesh network may include receiving, at a scheduler for the RTOS, a plurality of tasks to schedule for execution by one or more processors. The safety device is characterized by a prestressed tube sensorslide that is connected between the sabot, the ignition transmission charge and the explosive material container such that it can release or re-close an ignition channel disposed between the ignition transmission charge and the explosive material. The fluoresced x-rays are detected with an x-ray detector, and the piece of material is classified from the detected fluoresced x-rays. The performance level information is included in the request. The overlapped station forwards the inter-cell contention-free period value to member stations in the second cell. The device includes a main frame substantially filiform with a first end, to which a clamping part is assembled and fixed, and a second ring-shaped end, which is fastened to the clamping part.